One-Stop Fasteners Supplier
Thread Tensile Stress Area Calculator
Calculate the tensile stress area (As) for metric and unified inch threads per ISO 898 / ASME B1.1. The stress area is essential for computing bolt tensile strength, proof load, and tightening torque.
Calculator
Reference — Metric Coarse Thread Stress Areas
| Thread | d (mm) | P (mm) | As (mm²) |
|---|---|---|---|
| M3×0.5 | 3 | 0.5 | 5.03 |
| M4×0.7 | 4 | 0.7 | 8.78 |
| M5×0.8 | 5 | 0.8 | 14.2 |
| M6×1.0 | 6 | 1 | 20.1 |
| M8×1.25 | 8 | 1.25 | 36.6 |
| M10×1.5 | 10 | 1.5 | 58 |
| M12×1.75 | 12 | 1.75 | 84.3 |
| M14×2.0 | 14 | 2 | 115 |
| M16×2.0 | 16 | 2 | 157 |
| M18×2.5 | 18 | 2.5 | 192 |
| M20×2.5 | 20 | 2.5 | 245 |
| M22×2.5 | 22 | 2.5 | 303 |
| M24×3.0 | 24 | 3 | 353 |
| M27×3.0 | 27 | 3 | 459 |
| M30×3.5 | 30 | 3.5 | 561 |
| M33×3.5 | 33 | 3.5 | 694 |
| M36×4.0 | 36 | 4 | 817 |
| M42×4.5 | 42 | 4.5 | 1120 |
| M48×5.0 | 48 | 5 | 1470 |
Formula & Standards
Tensile Stress Area (ISO 898 / ASME B1.1):
As = (π / 4) × (d − 0.9382 × P)²
Where:
- d = Nominal (major) diameter of bolt thread (mm)
- P = Thread pitch (mm); for inch threads, P = 25.4 / TPI
- 0.9382 = Coefficient derived from H/6 + H/4, where H = 0.866025 × P (60° thread profile)
Reference: ISO 898-1:2013, ASME B1.1-2019. This area is used to calculate proof loads and tensile strengths (F = As × σ). For shear stress area of threads, separate calculation per ISO 898-2 applies.